[Adsorption behavior of reactive X-3B red dye in soil environment and relevant influencing factors]

The determination of rates of soil adsorbing reactive X-3B red dye opened out that the adsorption of the dye by soils could be divided into four stages: high-speed adsorption, slowdown adsorption, slow-speed adsorption and zero adsorption. There was a great difference in adsorptive rates between various soil types during these different stages. The research on adsorptive isotherms of reactive X-3B red dye pointed out that adsorptive behavior of the dye tallied with the Langmuir equation. The calculation on the basis of the adsorptive isotherms indicated that the maximum adsorption of the dye was in the sequence paddy soil > red soil > brown earth > cinnamon soil. As for relevant environmental factors influencing this adsorption, contents of organic matter and water in soils, soil pH and air temperature were involved. When soil organic matter or air temperature was reduced and soils were at neutral, runny or unwatered conditions, the adsorption of the dye on soils was decreased, thereby inhibiting the accumulation of the dye in soil environment.